Secunia Research: KVIrc irc:// URI Handler Command Execution Vulnerability
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Secunia Research 26/06/2007
- KVIrc irc:// URI Handler Command Execution Vulnerability -
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Table of Contents
Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10
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1) Affected Software
* KVIrc 3.2.0
NOTE: Other versions may also be affected.
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2) Severity
Rating: Moderately critical
Impact: System Access
Where: Remote
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3) Vendor's Description of Software
"KVIrc is a free portable IRC client based on the excellent Qt GUI
toolkit. KVIrc is being written by Szymon Stefanek and the KVIrc
Development Team with the contribution of many IRC addicted developers
around the world.".
Product Link: http://www.kvirc.net
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4) Description of Vulnerability
Secunia Research has discovered a vulnerability in KVIrc, which can be
exploited by malicious people to compromise a user's system.
The vulnerability is caused due to the "parseIrcUrl()" function in
src/kvirc/kernel/kvi_ircurl.cpp not properly sanitising parts of the
URI when building the command for KVIrc's internal script system. This
can be exploited to inject and execute commands for the KVIrc script
system (including the "run" command, which can be leveraged to execute
shell commands) by e.g. tricking a user into opening a specially
crafted "irc://" or similar URI (e.g. "irc6://").
Successful exploitation requires that KVIrc is the default handler for
"irc://" and similar URIs.
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5) Solution
Fixed in the SVN repository.
https://svn.kvirc.de/kvirc/changeset/630/#file3
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6) Time Table
19/06/2007 - Vendor notified.
19/06/2007 - Vendor response.
21/06/2007 - Vendor commits fix into SVN repository.
26/06/2007 - Public disclosure.
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7) Credits
Discovered by Stefan Cornelius, Secunia Research.
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8) References
The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-2951 for the vulnerability.
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9) About Secunia
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10) Verification
Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-56/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
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